Neuromuscular relaxants

ABSTRACT

Alkoxy and/or acyloxy disubstituted and polysubstituted aralkyl and aralkenyl bis-quaternary ammonium derivatives of cyclic alkanol diesters have neuromuscular relaxant properties.

This is a continuation-in-part of U.S. application Ser. No. 09/426,673, filed Oct. 25, 1999, now U.S. Pat. No. 6,274,623 which is a continuation of U.S. application Ser. No. 08/957,240, filed Oct. 24, 1997, now U.S. Pat. No. 5,990,124, each of which is expressly incorporated herein by reference in their entirety.

FIELD OF INVENTION

This invention relates to compounds useful as muscle relaxants. In one of its more particular aspects, the invention relates to a series of alkoxy- and acyloxy-substituted aralkyl and aralkenyl bis quaternary ammonium derivatives of cyclic alkanol diesters. This invention also relates to methods for the preparation and use of such compounds as muscle relaxants and to pharmaceutical compositions containing such compounds.

BACKGROUND OF THE INVENTION

During surgery it is preferred that the muscles of the patient be as relaxed as possible. Although general anesthesia renders the patient unconscious, it only rarely provides sufficient skeletal muscle relaxation. A variety of muscle relaxant agents, also known as neuromuscular blocking agents, are used for muscle relaxation during surgery. One muscle relaxant used frequently in the past is succinylcholine, which has a very rapid onset and short duration of clinical action. However, succinylcholine elicits muscle membrane “depolarization” which makes this compound less desirable. Furthermore, it may produce serious side effects.

Several other so called “non-depolarizing” muscle relaxants are known and used in anesthesia and surgery. These chemically diverse non-depolarizing muscle relaxants include, among others: tubocurarine, pancuronium, atracurium, cisatracurium, vecuronium, mivacurium and rocuronium. The common structural feature of these compounds is one or usually two quaternary nitrogen atoms. They are all clinically acceptable because they produce only mild or no side effects. However, their onset of action is too slow and their duration of action is too long. Thus, these agents, without exception, fall short of the requirements of an “ideal” surgical muscle relaxant.

Hungarian Patent No. 142,597 issued on Sep. 15, 1955, discloses a series of compounds having a pair of tropine moieties bound by an ester linkage to an aliphatic or aromatic diacid. The nitrogens on both tropines are quaternized with alkyl or unsubstituted or monosubstituted benzyl groups.

Certain naturally occurring alkaloids consist of dicarboxylic acid esters of azabicyclo alkanols, such as belladonnine, which is a bis tropinester, and thesine, which is a bis oxymethyl pyrrolizidine ester. Only the ethyl quaternary derivative of belladonnine and the methyl quaternary derivative of thesine have been reported as muscle relaxants.

Some other neuromuscular blocking agents that include pairs of quaternary nitrogens as part of a tropane ring system have been reported in the literature. In these compounds tropinyl moieties are joined by bridging the two quaternary nitrogens. U.S. Pat. No. 2,746,964 (1953) discloses dicarboxylic acid esters of 3-piperidinol and their alkyl quaternary derivatives.

It is an object of the present invention to provide new and improved muscle relaxants which are characterized by very rapid onset and short duration of neuromuscular blocking action.

SUMMARY OF THE INVENTION

In our research for the “ideal” muscle relaxant we have discovered that in general, di- or poly- alkoxy- or acyloxy-substituted aralkyl and aralkenyl quaternary ammonium derivatives of cyclic aminoalkanol diesters either exhibited less side effects such as decreased blood pressure and increased heart rate or greater potencies than other agents with alkyl, unsubstituted aralkyl, or monosubstituted aralkyl quaternary groups. In particular, such alkoxy- and acyloxy-substituted aralkyl and aralkenyl quaternary derivatives of cyclic aminoalkanol diesters were much more rapidly and shorter acting than any “nondepolarizing” muscle relaxant compound hitherto known. This discovery was entirely unexpected and unpredicted and thus forms the basis of this invention.

This invention consists of a series of di- or poly-alkoxy- or acyloxy-substituted aralkyl and aralkenyl bis-quaternary ammonium derivatives of cyclic alkanol esters of dicarboxylic acids as neuromuscular relaxants, methods of making and using them, and pharmaceutical compositions containing them.

The first aspect of this invention is a group of compounds 1/a, having the general formula illustrated below:

A second aspect of this invention is a group of compounds 1/b, having the general formula illustrated below:

A third aspect of this invention is a group of compounds 1/c, having the general formula illustrated below:

where A is alkanedicarbonyl, alkenedicarbonyl, alkynedicarbonyl, cycloalkanedicarbonyl, cycloalkenedicarbonyl, bicycloalkanedicarbonyl, bicycloalkenedicarbonyl, polycycloalkanedi-carbonyl, polycycloalkenedicarbonyl, aromatic dicarbonyl, substituted alkanedicarbonyl, substituted alkenedicarbonyl, substituted alkynedicarbonyl, substituted bicycloalkanedicarbonyl, substituted bicycloalkenedicarbonyl, or substituted aromatic dicarbonyl; R₁ and R₁′ are di- or polysubstituted aralkyl or aralkenyl in which at least one of the substituents is alkoxy or acyloxy; R₂ and R₂′ are alkyl or alkenyl; n is 0, 1, or 2; m is 0, 1, or 2; p is 0, 1, or 2; R₃ and R₃′ are H, CH₃, or lower alkyl; R₄ and R₄′ are H, CH₃, or lower alkyl; R₃ and R₄ can also be —(CH₂)_(g)—, —CH═CH—, —(CH₂)_(h)—O—(CH₂) _(k)—, -epoxy-, or—(CH₂)_(h)—S—(CH₂)_(k)—, where g is 2, 3, 4, or 5, h is 1 or 2, and k is 1 or 2; and R₃′ and R₄′ can also be —(CH₂)_(g)—, —CH═CH—, —(CH₂)_(h)—O—(CH₂)_(k)—,

or —(CH₂)_(h)—S—(CH₂)_(k)—, where g is 2, 3, 4, or 5, h is 1 or 2, and k is 1 or 2; X is a pharmaceutically acceptable anion; R₁ and R₁ ′ can be the same or different; likewise R₂ and R₂′, R₃ and R₃′, and R₄ and R₄′ can be the same or different.

A fourth aspect of this invention is the method of use of the compounds of the general formulae 1/a-1/c as neuromuscular relaxants.

A fifth aspect of this invention is a pharmaceutical composition, including the compounds of general formulae 1/a-1/c and a pharmaceutically acceptable excipient.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Definitions

As used herein, the term “alkyl” refers to a hydrocarbon radical having from 1 to 20 carbon atoms. In this invention alkyl can be non-substituted, for example, methyl, butyl, octyl, and dodecyl.

As used herein, the term “alkenyl” refers to any hydrocarbon radicals having from 1 to 20 carbon atoms that includes at least one carbon-carbon double bond at any position. Examples include ethenyl, 2-butenyl, 5-octenyl, and 2,10-dodecenyl.

As used herein, the term “alkynyl” refers to hydrocarbon radicals having from 1 to 20 carbon atoms that includes at least one carbon-carbon triple bond at any position. Examples include acetylenyl, 2-butynyl, 5-octynyl, and 1,7-decanediynyl.

As used herein, the term “aryl” refers to aromatic hydrocarbon radicals. Examples include phenyl, naphthyl, and anthracyl.

As used herein, the term “aralkyl” refers to aryl hydrocarbon radicals including an alkyl portion as defined above. Examples include benzyl, phenylethyl, and 6-napthylhexyl.

As used herein, the term “aralkenyl” refers to aryl hydrocarbon radicals including an alkenyl portion, as defined above. Examples include styryl, 3-benzylpropenyl, and 6-naphthyl-2-hexenyl.

As used herein, the term “cycloalkyl” refers to an alkyl that has its carbon atoms arranged into a ring. Examples include cyclohexyl, cyclobutyl, and cyclododecyl.

As used herein, the term “cycloalkenyl” refers to an alkenyl that has its carbon atoms arranged into a ring. Examples include cyclohexenyl and 1,5-cyclododecadienyl.

As used herein, the term “bicycloalkyl” refers to an alkyl that has its carbon atoms arranged into two rings. Examples include decahydronaphthyl, norbornyl, and bicyclo [2.2.2] octyl.

As used herein, the term “bicycloalkenyl” refers to an alkenyl that has its carbon atoms arranged into two rings. Examples include norbornenyl and 1,2,3,4,5,6,7,8-octahydronaphthyl.

As used herein, the term “polycycloalkyl” refers to an alkyl that has its carbon atoms arranged into three or more rings.

As used herein, the term “polycycloalkenyl” refers to an alkenyl that has its carbon atoms arranged into three or more rings.

As used herein, the term “substituted” refers to a hydrocarbon radical selected from the groups alkyl, alkenyl, alkynyl, aryl, aralkyl, aralkenyl, cycloalkyl, cycloalkenyl, bicycloalkyl, bicycloalkenyl, polycycloalkyl, polycycloalkenyl, and all as defined above, where one or more hydrogens have been replaced with alkyl, fluoride, chloride, bromide, iodide, hydroxy, mercapto, alkoxy, acyloxy, alkylthio, arylthio, acetamido, amino, or nitro group(s). Also the term “substituted” refers to a hydrocarbon radical selected from the groups alkyl, alkenyl, alkynyl, aryl, aralkyl, aralkenyl, cycloalkyl, cycloalkenyl, bicycloalkyl, bicycloalkenyl, polycycloalkyl, polycycloalkenyl, and all as defined above, where one or more carbons have been replaced with oxygen, sulfur, nitrogen, or silicon atom(s).

In case of the quaternizing aralkyl or aralkenyl groups, “disubstituted or polysubstituted” refers to two or more substituents, one or more of which shall be alkoxy or acyloxy and the other(s) shall be one or more identical or different substituents selected from the groups: alkyl, alkenyl, aryl, aralkyl, halogen, hydroxy, mercapto, alkoxy, aryloxy, acyloxy, acetamido, amino, alkylthio, arylthio, imino or nitro groups which replace two or more hydrogen atoms of the aralkyl or aralkenyl moiety.

As used herein, the term “alkyl-cycloalkyl” refers to a hydrocarbon radical including an alkyl and a cycloalkyl group. Examples include 3-methylcyclohexyl and 4-hexylcycloheptyl.

As used herein, the term “alkanedicarbonyl” refers to a radical that includes an alkyl as defined above and two carbonyl groups. Examples include succinyl, glutaryl, sebacyl, 1,11-dicarboxyundecanyl, and the like.

As used herein, the term “alkenedicarbonyl” refers to a radical that includes at least one carbon-carbon double bond and two carbonyl groups. Examples include 1,3-discarboxypropenyl, 1,6-dicarboxy-3 -hexenyl, and traumatyl (1,10-dicarboxy-2-decenyl).

As used herein, the term “alkynedicarbonyl” refers to a radical that includes at least one carbon-carbon triple bond and two carbonyl groups. Examples include 1,2-dicarboxypropynyl, 1,6-dicarboxy-2-hexynyl, and the like.

As used herein, the term “bicycloalkanedicarbonyl” refers to a radical that includes bicycloalkenyl as defined above and two carbonyl groups. Examples include 5-norbornane-2,3-dicarbonyl, dicahydronaphthalene-1,5-dicarbonyl, and 9,10-dihydro-9,10-ethanoanthracene-11,12-dicarbonyl.

As used herein, the term “bicycloalkenedicarbonyl” refers to a radical that includes bicycloalkenyl as defined above and two carbonyl groups. Examples include 3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl and 1,2,3,4,5,6,7,8-octahydronaphthalene-1,5-dicarbonyl.

As used herein, the term “aromatic dicarbonyl” refers to a radical that includes an aromatic group substituted with two carbonyl groups. Examples include phthalyl, terephthalyl, 1,4-dicarboxynaphthyl, and the like.

As used herein, the term “acyloxy” refers to RC(O)O— in which R is a normal or substituted hydrogen, alkyl, alkenyl, alkynyl, aryl, cycloalkyl, cycloalkenyl, bicycloalkyl, or bicycloalkenyl. Examples include acetoxy, propionyloxy, 2,3-difluorobutyryloxy, benzoyloxy, cyclopropylacetoxy and chloroacetoxy.

As used herein, the term “tropine” refers to tropine (8-methyl-8-azabicyclo [3.2.1]octan-3α-ol), also known as alpha or endo tropine, and pseudotropine (8-methyl-8-azabicyclo[3.2.1]octan-3β-ol), also known as beta or exo tropine, dependent on the configuration of the hydroxy group attached to the C3 atom of tropine.

As used herein, the term “granatanol” refers to 9-methyl-9-azabicyclo[3.3.1]nonan-3α-ol or 9-methyl-9-azabicyclo[3.3.1]nonan-3β-ol, and also the term “granatanine” refers to 9-methyl-9-azabicyclo[3.3.1]nonane. It will of course be realized that the nitrogen atom of tropine and of granatanol is already methyl substituted. Therefore, when the tropine or granatanol nitrogen is referred to as substituted, as in N-methyltropinium iodide, it will be understood that the nitrogen is a quaternary nitrogen and the halide is present for charge balance.

As used herein, the term “pharmaceutically acceptable anion” refers to an anion that has little or no toxic effect and does not significantly influence the pharmacological action of a pharmaceutically administered dose. Examples include chloride, bromide, iodide, nitrate, sulfate, phosphate, sulfonate, mesylate, besylate, tosylate, and the like.

A variety of optical isomers, enantiomeric pairs, and diastereomeric pairs exist for many of the compounds within the scope of the present invention. All such compounds are intended, as are all mixtures of optical isomers, enantiomeric pairs and diastereomeric pairs, for each structural variation, including all pure compounds and racemic mixtures.

Both cis and trans geometrical isomers and mixtures are intended.

Syntheses

There will now be described various synthetic pathways for preparing the compounds of the present invention. These pathways will be illustrated using N-methyl-8-azabicyclo [3.2.1]octan-3α-ol (tropine) as an example of the starting material. Other suitable cyclic aminoalkanols can be used as well.

Synthetic Pathway A

Referring to eq. A of Synthetic Pathway A, the procedure is carried out as follows. To a cooled solution of one equivalent of the appropriate diacyl halide (II) in dry methylene chloride in an ice bath is added dropwise two equivalents of tropine in dry methylene chloride, and then the mixture is allowed to warm up to room temperature. After the reaction mixture is poured into the cold water, the aqueous layer is adjusted to pH 10-11 with 6N NaOH aqueous solution, and extracted with chloroform. The diester (III) is then purified by a chromatographic technique.

In eq. B, one equivalent of the purified diester (III) is taken up in a moderately polar aprotic solvent, such as acetone or acetonitrile. Two and one-half equivalents of the appropriate alkoxy, acyloxy or alkoxyacyloxy substituted aralkyl or aralkenyl halide, RX (IV) are added. The resulting solution is heated at between 50° C. and 150° C. for 6 to 12 hours depending on the reactants. The resulting quaternary salts are filtered, and purified by recrystallization.

Synthetic Pathway B

Referring to eq. C of Synthetic Pathway B, in an alternative synthetic pathway one equivalent of the appropriate tropine (I) and one and one-quarter equivalents of the desired alkoxy, acyloxy or alkoxyacyloxy substituted aralkyl or aralkenyl halide (IV) are heated together in a moderately polar aprotic solvent, such as acetone or acetonitrile, for between 6 and 12 hours at between 50° C. and 100° C. The resulting quaternary ammonium salt (V) is filtered and purified by recrystallization.

Then, as shown in eq. D, two equivalents of the recrystallized quaternary salt (V) are reacted with one equivalent of the appropriate organic diacyl halide (II) in dry methylene chloride in a sealed vessel. The ingredients are heated in a closed vessel at 80-100° C. After the solvent is removed, the residue is purified by recrystallization and pure compound of Formula 1/a, 1/b and 1/c are obtained.

The compounds of Formula 1/a-1/c of this invention can also be asymmetrical diammonium esters. These compounds are made by the following method: No more than one equivalent of a first, alkoxy or acyloxy substituted aralkyl or aralkenyl halide (RX) and one equivalent of diester (III) in acetone or acetonitrile are heated at 50° C. for 12hours; To the reaction mixture is added a second, quaternizing compound, RX (IV). Then the reaction mixture is heated again at 80-100° C. for 12 hours. The resulting precipitate is purified by recrystallization.

An alternative to synthetic pathway A is illustrated in Synthetic Pathway C.

Synthetic Pathway C

Other suitable cyclic aminoalkanol hydrochlorides, such as tropine hydrochloride or granatanol hydrochloride, can be used as well.

Utility

The compounds of Formulae 1/a, 1/b and 1/c show marked activity as neuromuscular blocking agents. Such agents are typically administered intravenously. The form of administration can be a single injection, a series of injections, or the agent can be given as a component of an intravenous infusion. The compounds of this invention are characterized by rapid onset and short duration of action to the extent that they are clearly superior to any existing known muscle relaxants. Regarding side effects, the compounds of this invention have markedly reduced cardiovascular side effects associated with succinylcholine, tubocurarine or gallamine, the earlier prototypes of clinically used muscle relaxants.

The bolus dosage may vary markedly between each individual patient as it does with other muscle relaxants, but generally, as estimated on the basis of animal experiments, the dose will be between 0.1 and 1.0 mg/kg of body weight. The precise dose must be arrived at after having considered each individual case, including age, sex, weight and general condition of the patient and the degree of muscle relaxation desired.

The form of dosage can be liquid solution, either for direct injection or for addition to an intravenous fluid, or it can be a solid powder or granular material to be made into a solution prior to use. The liquid or solid can be formulated by any conventional means.

One or more pharmaceutically acceptable excipients or adjuvants may be included in a clinical formulation, including pH modifiers, stabilizers, preservatives, biologically necessary salts, sugars, and the like.

The activity of these compounds can be tested by any of several methods.

The utility of the compounds of Formulae 1/a, 1/b and 1/c have been tested by using anesthetized rats and/or cats, rabbits, dogs, guinea pigs, pigs, or monkeys. A leg tendon is attached to a transducer. An appropriate motor nerve, e.g. the sciatic or common peroneal nerve is stimulated. The resultant muscle twitches are transduced and recorded. As the neuromuscular blocking agents of this invention are administered into a vein, the muscle twitch response to the stimulation decreases. This dose-dependent decrease is measured. Likewise, the onset and duration of this action can be determined, and compared with those of known, clinically used agents. Electromyographic and mechanomyographic methods are both acceptable.

The invention will be better understood by reference to the following examples which are included merely for purposes of illustration and are not to be construed as limiting the scope of the present invention.

The following example illustrates Synthetic Pathway A.

EXAMPLE 1

Preparation of bis-tropan-3-yl Succinate

To a solution of 14.1 g (100 mmol) of tropine in 50 mL of methylene chloride is added dropwise 7.75 g (50 mmol) of succinyl chloride in 100 mL of methylene chloride with cooling in an ice bath. Then the mixture is allowed to warm to room temperature. After the reaction mixture is poured into 200 mL of cold water, the aqueous layer is adjusted to pH 10-11 with 6 N NaOH aqueous solution and extracted with chloroform. The resulting oil is purified by column chromatography (silica gel, 20% methanol in chloroform) to yield 11.8 g (65%) of bis-tropan-3-yl succinate as a thick oil.

Similarly, by substituting:

malonyl chloride

glutaryl chloride

thiodiglycolyl chloride

2-ketoglutaryl chloride

adipoyl chloride

sebacyl chloride

4, 4′- dithiodibutyryl chloride

1,11- undecanedicarbonyl dichloride

fumaryl chloride

trans-traumatyl chloride

acetylenedicarbonyl chloride

trans-1,2-cyclobutanedicarbonyl dichloride

1,3-cyclohexanedicarbonyl dichloride

1,1-cyclopentanediacetyl dichloride

phthaloyl chloride

4,5-dichlorophthaloyl chloride

trans-3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl chloride

one can obtain:

bis(tropan-3-yl)malonate

bis(tropan-3-yl)glutarate

bis(tropan-3-yl)thiodiglycolate

bis(tropan-3-yl)2-ketoglutarate

bis(tropan-3-yl)adipate

bis(tropan-3-yl)sebacate

bis(tropan-3-yl)4, 4′-dithiodibutyrate

bis(tropan-3-yl)1,11-undecanedicarboxylate

bis(tropan-3-yl)fumarate

bis(tropan-3-yl)trans-traumate

bis(tropan-3-yl)acetylenedicarboxylate

bis(tropan-3-yl)cyclobutane-1,2-dicarboxylate

bis(tropan-3-yl)cyclohexane-1,3-dicarboxylate

bis(tropan-3-yl) cyclopentane-1,1′-diacetate

bis(tropan-3-yl) phthalate

bis(tropan-3-yl) 4,5-dichlorophthalate

bis(tropan-3-yl) trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate

Similarly, by substituting other cyclic aminoalkanols for tropine as indicated in formulae 1/a, 1/b and 1/c as starting material and the acyl chlorides listed, one can obtain the corresponding dicarboxylic acid esters.

EXAMPLE 2

Preparation of bis-[N-(3,4-diacetoxybenzyl)tropanium-3-yl]succinate Dibromide

To a solution of 5.0 g (13.7 mmol) of bis-tropan-3-yl succinate in 100 mL of dry acetone is added 9.8 g (34.3 mmol) of 3,4-diacetoxybenzyl bromide (prepared from 3,4-dihydroxybenzaldehyde through acetylation of the hydroxy groups, reduction of the aldehyde to the corresponding alcohol, and bromination). Then the mixture is heated at 60-70° C. for 10 hours. The precipitate is collected by filtration, washing with acetone and ether, and drying under vacuum to yield 9.6 g (75%) of bis-[N-(3,4-diacetoxybenzyl) tropanium-3-yl] succinate dibromide as a white powder, which is further purified by recrystallization with methanol-methylene chloride.

Similarly by substituting, for example:

2,5-diacetoxybenzyl bromide

3,4,5-triacetoxybenzyl bromide

3,4-dipropionyloxybenzyl bromide

2,4-dibutyryloxybenzyl bromide

4-acetoxy-3-methoxybenzyl bromide

4-acetoxy-3,5-dimethoxybenzyl bromide

2,5-dimethoxybenzyl bromide

3,4,5-trimethoxybenzyl bromide

3,4-diethoxybenzyl bromide

3,4-diacetoxyphenylethyl bromide

3-(3,4-diacetoxyphenyl)propenyl bromide

and 3,5-diacetoxy-2-naphthylmethyl bromide,

one can prepare:

bis[N-(2,5-diacetoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(3,4,5-triacetoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(3,4-dipropionyloxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(2,4-dibutyryloxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(4-acetoxy-3-methoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(4-acetoxy-3,5-dimethoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(2,5-dimethoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(3,4,5-trimethoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(3,4-diethoxybenzyl) tropanium-3-yl] succinate dibromide

bis[N-(3,4-diacetoxyphenylethyl) tropanium-3-yl] succinate dibromide

bis[N-(3-(3 ,4-diacetoxyphenyl)propenyl) tropanium-3-yl] succinate dibromide, and

bis[N′-(3,5-diacetoxy-2-naphthylmethyl) tropanium-3-yl] succinate dibromide.

It will be realized by one skilled in the art that both starting materials could be substituted. For example if 4-acetoxy-3-methoxybenzyl bromide is substituted for 3,4-diacetoxybenzyl bromide and bis-tropan-3-yl glutarate, bis-tropan-3-yl sebacate, and bis-tropan-3-yl cyclobutane-1,2-dicarboxylate are substituted for bis-tropan-3-yl succinate, then one obtains: bis [N-(4-acetoxy-3-methoxybenzyl)tropanium-3-yl] glutarate dibromide, bis-[N-(4-acetoxy-3-methoxybenzyl)tropanium-3-yl] sebacate dibromide, and bis-[N-(4-acetoxy-3-methoxybenzyl) tropanium-3-yl] cyclobutane- 1 ,2-dicarboxylate dibromide.

The following example illustrates Synthetic Pathway B.

EXAMPLE 3

Preparation of N-(3,4,5-trimethoxybenzyl)tropinium Chloride

The mixture of 14.1 g (100 mmol) of tropine and 26.0 g (120 mmol) of 3,4,5-trimethoxybenzyl chloride in 300 mL of acetone is heated at 60-70° C. for 10 hours in a sealed tube. The precipitate is then filtered, washed, and recrystallized to yield 28.6 g (80%) of N-(3,4,5-trimethoxybenzyl) tropinium chloride as a white powder.

Similarly, by substituting, for example:

2-methoxy-5-nitrobenzyl bromide

4-acetoxy-3,5-dimethoxybenzyl chloride

3-(3,4-dipropionyloxyphenyl)propyl bromide

3,5-diacetoxy-2-naphtylmethyl bromide

4-acetoxy-3-chlorobenzyl bromide

one can prepare:

N-(2-methoxy-5-nitrobenzyl) tropinium bromide

N-(4-acetoxy-3,5-dimethoxybenzyl) tropinium chloride

N-(3-(3,4 dipropionyloxyphenyl)propyl) tropinium bromide

N-(3,5 diacetoxy-2-naphthylmethyl) tropinium bromide

N-(4-acetoxy-3-chlorobenzyl) tropinium bromide

EXAMPLE 4

Preparation of bis-[N-(3,4,5-trimethoxybenzyl )tropanium-3-yl]succinate Dichloride

N-(3,4,5-Trimethoxybenzyl)tropinium chloride (20.0 g, 56.0 mmol) and 4.35 g (28.0 mmol) of succinyl chloride in 100 mL of dry methylene chloride are heated at 100° C. for 12 hours in a sealed tube. After 5 mL of methanol is added to the cooled reaction mixture, solvent is removed on a rotary evaporator. The product is purified by recrystallization from methanol-methylene chloride, yielding 12.0 g (54%) of bis [N-(3,4,5-trimethoxybenzyl)tropanium-3-yl] succinate dichloride.

Similarly by substituting, for example:

N-(2 methoxy-5-nitrobenzyl) tropinium bromide

N-[3-(3,4-dipropionyloxyphenyl)propyl] tropinium bromide

N-(3,5-diacetoxy-2-naphthylmethyl) tropinium bromide

N-(4-acetoxy-3,5-dimethoxybenzyl) tropinium chloride

N-(4-acetoxy-3-chlorobenzyl) tropinium bromide

for N-(3,4,5-trimethoxybenzyl)tropinium chloride,

one can prepare:

bis [N-(2- methoxy-5-nitrobenzyl) tropanium-3-yl] succinate dibromide

bis [N-(3-(3,4-dipropionyloxyphenyl)propyl) tropanium-3-yl] succinate dibromide

bis [N-(3,5-diacetoxy-2-naphthylmethyl) tropanium-3-yl] succinate dibromide

bis [N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3-yl] succinate dichloride

bis [N-(4-acetoxy-3-chlorobenzyl)tropanium-3-yl] succinate dibromide

The following example illustrates the preparation of an asymmetrical diammonium ester.

EXAMPLE 5

Preparation of [N-(2,5-dimethoxybenzyl)tropanium-3-yl], [N-(3,4-diacetoxybenzyl)tropanium-3-yl]succinate Dibromide

To a solution of 18.2 g (50 mmol) of bis(tropan-3-yl) succinate in 500 mL of dry acetone in a sealed bottle is added 11.6 g (50 mmol) of 2,5-dimethoxybenzyl bromide. After the mixture is heated at 50° C. for 24 hours, 14.3 g (50 mmol) of 3,4-diacetoxybenzyl bromide is added to the cooled mixture. Then the mixture is heated again at 70-75° C. for another 10 hours. The resulting white precipitate is collected by filtration, and purified by recrystallization (2×) from MeOH-methylene chloride to yield 9.0 g (20%) of [N-(2,5-dimethoxybenzyl) tropanium-3-yl], [N-(3,4-diacetoxybenzyl)tropanium-3-yl] succinate dibromide as a white powder.

Similarly, for example, by substituting 3,4-dibromophenethyl bromide and 3-(4,6-dimethoxynaphth-2-yl)propenyl bromide for 2,5-dimethoxybenzyl bromide and 3,4-diacetoxybenzyl bromide, respectively, one can obtain [N-(3,4-dibromophenethyl) tropanium-3-yl], [N- {3-(4,6-dimethoxynaphth-2-yl) propenyl}tropanium-3-yl] succinate dibromide.

The following example illustrates Synthetic Pathway C.

EXAMPLE 6

Preparation of bis[quinuclidin-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate

To a solution of trans-3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl chloride (2.63 g. 12.0 mmol) in 20 mL of methylene chloride in a sealed tube is added 3-quinuclidinol hydrochloride (4.50 g, 27.5 mmol). The heterogeneous mixture is heated to 80° C. overnight. After it is cooled, the mixture is poured into 100 mL of 2 N NaOH aqueous solution, and extracted with CHCl₃. The combined organic layer is dried over MgSO₄ and concentrated. The resulting oil is purified by column chromatography (silica gel, 10% MeOH in CHCl₃) to yield 4.0 g (83%) of bis[quinuclidin-3-yl] trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate as a white solid.

EXAMPLE 7

Preparation of bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate Dibromide

A solution of bis[quinuclidin-3-yl] trans-3,6-endomethylene- 1,2,3,6-tetrahydrophthalate (1.0 g, 2.5 mmol) and 4-acetoxy-3-methoxybenzyl bromide (1.6 g, 6.25 mmol) in 30 mL of acetone is heated at 60° C. in a sealed tube for 10 hours. The white solid (1.22 g, 54%) precipitated out is collected by a vacuum for 1 hour.

Elemental analysis of this compound and other representative compounds are shown in Table 1, wherein C, H, and N are shown as weight %. High resolution mass data and melting points are shown in Table 2.

Similarly, by appropriate choices of starting materials other symmetric and asymmetric bis quaternary ammonium salts of the general structures of 1/a, 1/b and 1/c can be made, for example:

[N-ethyl, N-(4-acetoxy-3,5-dimethoxybenzyl) nor-granataninium-3-yl], [N-ethyl, N-(3,5-dinitrobenzyl) nor-granataninium-3-yl] cyclobutane-1,2-dicarboxylate dibromide,

bis [N-(2,5-dimethoxybenzyl) quinuclidinium-3-yl] isophthalate dibromide,

bis[N-(3,4-dipropionyloxyphenethyl) 1,2,6-trimethylpiperidinium-4-yl]cyclopentane-1,1-dibutyrate dibromide.

TABLE 1 Calculated Value Observed Value ELEMENT ANALYSIS Formula C H N C H N New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6- C₄₃H₅₄N₂O₁₀Br₂.3H₂O 53.09 6.17 2.88 53.51 6.55 2.93 endomethylene-1,2,3,6-tetrahydrophtalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene- 1,2,4,6-tetrahydrophthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3αyl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9- nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6- C₄₇H₆₂N₂O₁₂Br₂.H₂O 55.08 6.25 2.73 54.36 6.45 2.73 endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2- dicarboxylate dibromide bis[N(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane- C₄₈H₆₈N₂O₁₂Br₂.H₂O 55.28 6.72 2.68 54.14 6.57 2.77 1,3-dicarboxylate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6- C₄₅H₅₈N₂O₁₀Br₂.H₂O 56.02 6.22 2.90 54.71 6.12 2.88 endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2- C₄₂H₅₆N₂O₁₀Br₂.H₂O 54.42 6.26 3.02 52.75 6.57 3.04 dicarboxylate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,3- C₄₄H₆₀N₂O₁₀Br₂.H₂O 55.34 6.50 2.94 53.93 6.59 3.07 dicarboxylate dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene- C₄₇H₅₈N₂O₁₂Br₂.2H₂O 53.41 6.06 2.65 53.51 6.55 2.93 1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate C₄₄H₅₆N₂O₁₂Br₂.2H₂O 52.80 6.00 2.80 52.50 6.26 2.89 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,3-dicarboxylate C₄₆H₆₀N₂O₁₂Br₂.H₂O 54.76 6.15 2.78 53.05 6.35 2.85 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide C₄₃H₅₆N₂O₁₂Br₂.H₂O 53.20 5.98 2.89 52.08 6.32 3.00 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene- C₄₇H₅₈N₂O₁₂Br₂.H₂O 55.29 5.88 2.75 54.87 5.99 2.89 1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide C₄₅H₆₀N₂O₁₂Br₂.H₂O 54.10 6.21 2.81 53.62 6.20 2.91 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide C₄₆H₆₂N₂O₁₂Br₂ 55.53 6.24 2.82 53.71 6.25 3.04 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide C₄₇H₆₄N₂O₁₂Br₂ 55.95 6.36 2.78 53.60 6.29 2.69 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide C₄₈H₆₆N₂O₁₂Br₂ 56.36 6.46 2.74 54.89 6.40 2.91 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2- C₄₆H₆₀N₂O₁₂Br₂.H₂O 54.65 6.14 2.77 52.53 6.13 2.85 dicarboxylate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide C₄₇H₆₄N₂O₁₂Br₂.H₂O 54.97 6.43 2.63 54.66 6.42 2.94 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide C₄₈H₆₆N₂O₁₂Br₂ 56.36 6.46 2.74 56.00 6.40 2.88 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2- C₄₈H₆₄N₂O₁₂Br₂ 56.47 6.27 2.75 54.30 6.25 2.81 dicarboxylate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide C₄₉H₆₈N₂O₁₂Br₂.H₂O 55.78 6.64 2.66 55.00 6.38 2.78 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide C₅₀H₇₀N₂O₁₂Br₂.H₂O 56.18 6.74 2.62 56.09 6.79 2.76 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide C₅₁H₇₂N₂O₁₂Br₂ 57.52 6.77 2.63 57.16 6.69 2.77 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2- C₅₀H₆₈N₂O₁₂Br₂.H₂O 56.29 6.56 2.62 55.92 6.34 2.82 dicarboxylate dibromide

TABLE 2 Melting High Resolution Mass Point High Resolution Mass Data and Melting Point Formula calculated found (° C.) New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3yl]trans-3,6-endomethylene-1,2,3,6-tetra- C₄₃H₅₄N₂O₁₀Br 837.2962 837.2961 229-231 hydrophthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 192-194 phthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 184-195 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 230-231 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetra- 223-224 hydrophthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate 230-231 dibromide bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate 233-234 dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetra- C₄₅H₅₈N₂O₁₀Br 865.3275 865.3275 212-213 hydrophthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide C₄₂H₅₆N₂O₁₀Br 827.3118 827.3102 203-204 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide C₄₄H₆₀N₂O₁₀Br 857.3411 857.3449 215-216 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- C₄₇H₅₈N₂O₁₂Br 921.3173 921.3178 219-220 phthalate dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide C₄₄H₅₆N₂O₁₂Br 883.3017 883.3027 205-206 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide C₄₆H₆₀N₂O₁₂Br 911.3331 911.3335 211-212 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide C₄₃H₅₆N₂O₁₂Br 873.2996 873.2996 200-201 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 218-219 phthalate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide C₄₅H₆₀N₂O₁₂Br 899.3331 899.3353 186-187 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide C₄₆H₆₂N₂O₁₂Br 913.3486 913.3491 180-181 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]primelate dibromide C₄₇H₆₄N₂O₁₂Br 927.3643 927.3655 185-186 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide C₄₈H₆₆N₂O₁₂Br 941.3799 941.3784 195-196 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide C₄₆H₆₀N₂O₁₂Br 911.3331 911.3337 194-195 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide C₄₇H₆₄N₂O₁₂Br 927.3643 927.3651 212-213 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide C₄₈H₆₆N₂O₁₂Br 941.3801 941.3785 221-222 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide C₄₈H₆₄N₂O₁₂Br 939.3643 939.3659 218-219 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide C₄₉H₆₈N₂O₁₂Br 955.3956 955.3951 200-201 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide C₅₀H₇₀N₂O₁₂Br 969.4112 969.4086 208-209 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide C₅₁H₇₂N₂O₁₂Br 983.4269 983.4285 203-204 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide C₅₀H₆₈N₂O₁₂Br 967.3956 967.3957 199-200

EXAMPLE 8

In vivo Animal Testing of the Biological Activity of Neuromuscular Blocking Agents

The neuromuscular blocking activity and other effects (e.g. cardiovascular side effects) of selected agents were investigated on several different experimental animals. Justification for this approach lies in the commonly known fact that the pharmacodynamic and pharmacokinetic properties of these agents are markedly variable from species to species. Therefore, the most important aspects of the projected therapeutic utility of these agents, e.g., neuromuscular blocking potency, onset and duration of action, and side effects cannot be ascertained in “in vitro” preparations or by using only one species of animals.

Selected compounds of the present invention have been carefully investigated, first in “screening” experiments in rats, for determining neuromuscular blocking potency. Subsequently, selected compounds have been tested for specific effects, e.g. onset, duration of action, and side effects, on additional selected species of animals, such as cats, pigs, monkeys, rabbits and dogs.

The following is a description of the methods as used in the rat and the cat. These methods were also utilized on other species when needed.

a) Adult, male albino rats were anesthetized with pentobarbital injected intraperitoneally. The trachea was cannulated for artificial respiration via a small animal respirator. The carotid artery was cannulated for recording blood pressure via a transducer and heart rate by a cardiotachograph on a polygraph. One external jugular vein was cannulated for i.v. drug administration. Neuromuscular function was monitored by electromyography, recording evoked responses from the anterior tibial muscle as a result of supramaximal nerve stimuli consisting of single or “train-of-four” rectangular pulses of 0.1-0.2 msec duration every 10-12 seconds, delivered to the sciatic or common peroneal nerve by a laboratory nerve stimulator. Another mode of stimulation included repeated single stimuli delivered at 0.1 Hz or 1 Hz. Cardiac vagal block, a side effect of several muscle relaxant agents, was assessed by stimulating the cut cervical vagus nerve peripherally and determining the possible blocking effect against the vagally induced bradycardia. The agents were dissolved in physiologic saline and injected intravenously at appropriate time intervals. The intensity, onset, and duration of neuromuscular block and its type were determined with each agent. Through administering several doses, the doses corresponding to 50%, 80% and 90% neuromuscular block were determined. All agents were compared with selected standard neuromuscular blocking compounds, e.g. succinylcholine, pancuronium, mivacurium, or rocuronium. The resulting data are shown in Table 3, wherein:

ED50=intravenous dose, ug/kg, causing 50% neuromuscular block.

Onset=time in minutes to 80-85% neuromuscular block.

RI=recovery index, minutes, spontaneous recovery, 25-75% neuromuscular response.

VB=vagal block, %, at 80-85% neuromuscular blocking dose.

ΔHR=change in heart rate, %, at 80-85% neuromuscular blocking dose.

ΔBP=change in arterial blood pressure, %, at 80-85% neuromuscular blocking dose.

No=number of animals tested.

b) Adult cats were anesthetized with a mixture of 70 mg/kg alpha chloralose and 0.5 g/kg ethylurethane intraperitoneally. One thigh was fixed in a vertical position by means of a pin at the lower end of the femur. Needle electrodes were placed on the sciatic or the common peroneal nerve. A tendon of the anterior tibial muscle was attached to a force transducer and the muscle responses evoked, as described under a), were recorded. Both electromyographic and mechanomyographic responses can be quantified. Blood pressure and heart rate changes were recorded from appropriately cannulated arteries via a blood pressure transducer and cardiotachograph. The resulting data are shown in Table 4.

The techniques described under a) and b) were employed in other species as needed with the modification that juvenile pigs were initially anesthetized with inhalation of halothane (Table 5) and monkeys were initially sedated with intramuscular ketamine injections prior to inducing and maintaining general anesthesia using pentobarbital and propofol administered intravenously (Table 6). Rabbit data are shown in Table 7 and dog data are shown in Table 8.

All animal experiments considered together, these novel neuromuscular relaxants are 2-10 times faster and shorter acting than the comparison compounds.

FIG. 1 illustrates the neuromuscular blocking effect of bis[N-(3,4-diacetoxybenzyl) tropanium-3-yl] cyclobutane-1,2-dicarboxylate dibromide as compared with succinylcholine and rocuronium in the monkey. Shown are the EMG response for muscle relaxation and the blood pressure response against time in minutes.

RAT ED50 Onset RI VB ΔH ΔBP No. New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 2000 1.8 3 70 −5 −10 3 phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3═-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 57 1 1.9 32 0 0 5 dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 180 0.8 1.8 10 0 0 5 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 500 0.4 0.5 99 0 0 3 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 200 0.7 0.8 20 0 0 7 phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 367 0.4 0.45 20 0 0 3 bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate 270 0.55 0.45 0 0 0 3 dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 150 0.55 0.5 25 0 0 7 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 350 0.6 0.5 20 0 0 4 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 270 0.55 0.45 30 0 0 7 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 84 0.65 0.5 32 0 0 11 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 218 0.7 0.45 5 0 0 10 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 240 0.65 0.5 28 0 0 9 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 232 0.75 0.6 10 0 0 9 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 258 0.68 0.5 45 0 0 4 dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 170 0.6 0.45 0 0 0 7 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide 140 0.5 0.4 5 0 0 14 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide 175 0.45 0.4 0 0 0 8 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 450 0.4 0.35 60 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 133 0.5 0.4 2 0 0 3 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide 300 0.7 0.5 0 0 0 4 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide 217 0.6 0.4 18 0 0 4 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 238 0.6 0.6 17 0 0 5 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide 260 0.55 0.4 0 0 0 5 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide 320 0.4 0.35 0 0 −4 2 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide 450 0.5 0.35 2 −3 −6 3 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 155 0.45 0.35 0 0 0 8 Comparison Compounds: Rocuronium 450 0.95 1.3 60 0 0 7 Mivacurium 140 1.8 3.9 0 0 0 8 Atracurium 320 1.5 2.9 0 0 0 5 bis[N-methyl tropanium-3α-yl]glutarate diiodide 2000 1.2 4.2 100 0 0 4 bis[N-benzyl tropanium-3α-yl]glutarate dibromide 5500 2.5 3.7 100 0 −10 4 bis[N-(2-bromobenzyl)tropanium-3α-yl]glutarate dibromide 1400 2.3 3.6 100 0 −9 5

TABLE 4 Cat ED50 Onset RI VB ΔH ΔBP No New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 193 0.7 0.4 20 5 0 3 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 160 0.9 0.5 20 0 0 3 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 325 0.9 0.5 33 0 −5 2 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 120 0.9 0.5 30 −12 −30 2 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 135 0.95 0.5 12 0 0 4 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 110 0.8 0.5 34 −12 −25 2 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 183 1 0.6 8 0 0 3 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 700 0.7 0.4 60 0 −50 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide 400 0.7 0.5 70 0 −40 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 700 0.6 0.5 80 0 −20 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 400 0.6 0.5 0 0 1 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide Comparison Compounds: Rocuronium 185 2.1 3.8 0 0 6 Mivacurium 25 3.5 5 0 0 6 Atracurium 68 2.7 4.8 0 0 6 bis[N-(cyclopropylmethyl)tropanium-3α-yl]suberate dibromide 155 1.4 9 80 0 0 5 bis[N-methyl tropanium-3α-yl]sebacate diiodide 125 2.3 3.9 100 0 0 4

TABLE 5 Pig ED50 Onset RI VB ΔH ΔBP No New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 310 1.5 2.4 40 0 0 4 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 600 0.5 1.2 90 0 0 1 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 343 0.54 2 26 0 0 4 phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate 250 0.7 1.3 30 0 0 1 dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 190 0.6 1 43 0 0 4 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 268 0.5 0.87 46 0 0 4 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 183 0.6 0.75 65 0 0 3 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 197 0.65 0.9 42 0 0 6 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 275 0.68 0.85 42 0 0 7 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 225 0.8 0.85 54 0 0 6 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 230 0.95 1.1 41 0 0 6 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 160 1.1 2 100 −10 −5 1 dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 235 0.8 0.9 40 0 0 4 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide 140 0.7 0.9 51 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide 193 0.7 1 48 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 250 0.6 0.8 80 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 100 0.8 1 15 0 0 3 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide 450 1.1 0.6 70 0 0 1 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide 300 0.65 0.75 65 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 317 0.7 0.6 50 0 0 3 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide 230 0.5 0.65 35 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide 275 0.45 0.4 43 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide 700 0.5 0.5 30 0 0 1 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 190 0.5 0.4 18 0 0 4 Comparison Compounds: Rocuronium 350 1.5 3.2 47 0 0 7 Mivacurium 135 1.5 3.6 17 0 0 10 bis[N-(pentyl)tropanium-3α-yl]sebacate dibromide 300 2.00 6.9 50 0 0 4 bis[N-(3-(phenyl)prop-2-enyl)tropanium-3α-yl]1,10-decanedicarboxylate dibromide 170 1.60 6.4 27 0 −10 4

TABLE 6 Monkey ED50 Onset RI VB ΔH ΔBP No New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 55 0.85 0.5 0 0 1 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 92 0.75 0.5 0 0 2 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 100 0.9 0.5 0 0 1 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 60 0.8 0.65 0 0 2 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 54 0.95 0.4 0 0 3 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 75 0.95 0.65 0 0 2 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 88 1 0.8 0 0 3 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 75 0.7 0.4 0 0 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide 85 0.8 0.4 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide 150 1.2 0.55 0 0 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 200 0.9 0.4 0 0 1 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 86 0.7 0.4 0 0 4 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide Comparison Compounds: Rocuronium 13 3.5 5.6 0 0 6 Mivacurium 34 1.9 2.4 0 0 3 Atracurium 186 3 7.5 0 0 6

TABLE 7 Rabbit ED50 Onset RI VB ΔH ΔBP No New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 115 2.8 4.5 0 0 2 phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 10 4 9 0 0 2 dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 70 1.3 2.5 0 0 3 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide 500 0.35 0.35 0 0 3 bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 145 0.45 0.45 0 0 4 phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 298 0.5 0.55 0 0 6 bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate 400 0.45 0.4 0 0 3 dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 155 0.65 0.65 0 0 8 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 75 0.6 0.55 0 0 4 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 165 0.65 0.65 0 0 7 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 96 0.8 0.7 0 0 5 dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 78 0.8 0.6 0 0 4 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 100 0.9 0.7 0 0 4 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 65 0.9 0.7 0 0 6 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate 210 0.8 0.75 0 0 3 dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 165 0.65 0.55 0 0 7 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide 167 0.68 0.5 0 0 3 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide 266 0.72 0.6 0 0 4 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 475 0.5 0.55 0 0 2 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 115 0.6 0.6 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide 65 1 0.8 0 0 3 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide 75 0.9 0.65 0 0 3 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 128 0.87 0.5 0 0 4 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide 135 0.7 0.55 0 0 4 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide 160 0.5 0.5 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide 500 0.45 0.4 0 0 2 bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 225 0.55 0.5 0 0 6 Comparison Compounds: Rocuronium 30 1.1 2.4 0 0 7 Mivacurium 20 2.8 3.9 0 0 4 Atracurium 30 2.7 5.7 0 0 7 bis[N-benzyl tropanium-3α-yl]sebacate dibromide 75 2.3 6 0 0 2 bis[N-ethyl tropanium-3α-yl]adipate diiodide 150 2.2 9 0 0 2

TABLE 8 Dog ED50 Onset RI VB ΔH ΔBP No New Compounds: bis[N-(4-acetoxy-3-methoxybenzyl)quinuclidinium-3-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(2,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]1,9-nonanedicarboxylate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- phthalate dibromide bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,5-dimethoxy-4-propionyloxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydro- 350 0.63 0.5 40 −25 2 phthalate dibromide bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 145 0.85 0.7 45 −15 2 bis[N-(4-acetoxy-3-methoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 280 0.75 0.5 38 −25 4 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide 100 0.9 0.65 10 −7 5 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]cyclohexane-1,3-dicarboxylate dibromide 128 0.75 0.55 30 −5 4 bis[N-(3,4-diacetoxybenzyl)tropanium-3α-yl]glutarate dibromide 110 0.9 0.6 0 0 5 bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl]trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]glutarate dibromide 225 0.65 0.6 50 −18 2 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]adipate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]pimelate dibromide bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]suberate dibromide 250 0.8 0.45 60 −55 2 bis[N-(3,4-diacetoxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide 150 0.75 0.7 27 −5 4 bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)tropanium-3α-yl]cyclobutane-1,2-dicarboxylate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]glutarate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]adipate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]pimelate dibromide bis[N-(3,4-dipropionyloxybenzyl)granataninium-3-yl]cyclobutane-1,2-dicarboxylate dibromide Comparison Compounds: Rocuronium 76 1.9 3.3 0 0 3

EXAMPLE 9

Illustrates the muscle relaxant (neuromuscular blocking) properties of selected agents of the types described. The data on muscle relaxant action were obtained on anesthetized rats, and when indicated, also on juvenile pigs

Adult, male albino rats were anesthetized with pentobarbital injected intraperitoneally. Juvenile, Duroc pigs 9-12 kg body weight were anesthetized with Chloralose Nembutal sodium mixture intraperitoneally after deep sedation with inhaled halothane. The trachea was cannulated for artificial respiration via a small animal respirator. The carotid artery was cannulated for recording blood pressure via a transducer and heart rate by a cardiotachograph on a polygraph. One external jugular vein was cannulated for i.v. drug administration. Neuromuscular function was monitored by electromyography, recording evoked responses from the anterior tibial muscle as a result of supramaximal nerve stimuli consisting of single or “train-of-four” rectangular pulses of 0.1-0.2 msec duration every 10-12 seconds, delivered to the sciatic or common peroneal nerve by a laboratory nerve stimulator. Another mode of stimulation included repeated single stimuli delivered at 0.1 Hz or 1 Hz. Cardiac vagal block, a side effect of several muscle relaxant agents, was assessed by stimulating the cut cervical vagus nerve peripherally and determining the possible blocking effect against the vagally induced bradycardia. The agents were dissolved in physiologic saline and injected intravenously at appropriate time intervals. The intensity, onset, and duration of neuromuscular block and its type were determined with each agent. Through administering several doses, the doses corresponding to 50%, 80% and 90% neuromuscular block were determined. All agents were compared with selected standard neuromuscular blocking compounds, e.g., rocuronium. The resulting data are shown in Table 9, wherein:

ED50=intravenous dose, ug/kg, causing 50% neuromuscular block.

Onset=time in minutes to 80-85% neuromuscular block.

RI=recovery index, minutes, spontaneous recovery, 25-75% neuromuscular response.

VB=vagal block, %, at 80-85% neuromuscular blocking dose.

HR=change in heart rate, %, at 80-85% neuromuscular blocking dose.

BP=change in arterial blood pressure, %, at 80-85% neuromuscular blocking dose.

N=number of animals tested.

TABLE 9 % VB at ED50 μg/kg BP % HR % Onset min RI min ED80 nmb n RAT New Compounds: Bis[N-(3,4-diacetoxybenzyl)-6-azabicyclo[3.2.1]octanium-3-yl]glutarate  440 (39)    0   0 0.55 (0.05) 0.4 (0.05)  19 (4)  7 dibromide Bis[N-(4-acetoxy-3-methoxybenzyl)-6-azabicyclo[3.2.1]octanium-3-yl]- 1425 (161) +12 (5)   0 0.53 (0.04) 0.65 (0.05)  68 (96)  4 glutarate dibromide Bis[N-(4-acetoxy-3,5-dimethoxybenzyl)-6-azabicyclo[3.2.1]octanium-3- 3050 (193) +21 (2)   0 0.75 (0.05) 1.4 (0.1)  75 (5)  4 yl]glutarate dibromide Bis[N-(3,4-dipropionyloxybenzyl)-6-azabicyclo[3.2.1]octanium-3-yl] 1002 (174)  +8 (2)   0 0.5 (0.03) 0.47 (0.03)  63 (7)  5 glutarate dibromide Bis[N-(3,4-diacetoxybenzyl)-6-azabicyclo[3.2.1]octanium-3-yl]-  384 (42)    0   0 0.7 (0.05) 0.5 (0.04)  5 (2)  5 cyclohexane-1,3-dicarboxylate dibromide Bis[4-dimethylaminocyclohexyl]glutarate bis(3,4-diacetoxybenzyl  700 (122) −13 (6) −5 (3) 0.75 (0.05) 0.8 (0.07)  64 (22)  4 bromide) Bis[4-dimethylaminocyclohexyl]glutarate bis(4-acetoxy-3-methoxy- 2075 (188) −14 (5) −5 (2) 0.84 (0.06) 0.9 (0.05)  73 (9)  4 benzyl bromide) Bis[4-dimethylaminocyclohexyl]fumarate bis(3,4-diacetoxybenzyl 2125 (475)  −4 (3) +6 (3) 1.3 (0.1) 1.5 (0.1)  65 (18)  4 bromide) Bis[4-dimethylaminocyclohexyl]fumarate bis(4-acetoxy-3-methoxy- 2138 (128)    0   0 1.3 (0.05) 0.65 (0.05) 100 (2)  4 benzyl bromide) Comparison compounds: Bis[4-dimethylaminocyclohexyl]glutarate bis(benzyl bromide) 2500 −15 (5)   0 1.6 (0.1) 1.65 (0.1) 100  4 Rocuronium  450 (48)    0   0 0.95 1.3  60  7 PIG New Compound: Bis[N-(3,4-diacetoxybenzyl)-6-azabicyclo[3.2.1]octanium-3-yl]cyclo-  780    0   0 0.5 0.85  70  3 hexane-1,3-dicarboxylate dibromide Comparison compound: Rocuronium  350    0   0 1.5 3.2  47 11

Those skilled in the art will further appreciate that the present invention may be embodied in other specific forms without departing from the spirit or central attributes thereof. In that the foregoing description of the present invention discloses only exemplary embodiments thereof, it is to be understood that other variations are contemplated as being within the scope of the present invention. Accordingly, the present invention is not limited to the particular embodiments which have been described in detail herein. Rather, reference should be made to the appended claims as indicative of the scope and content of the present invention. 

We claim:
 1. A method for neuromuscular blocking comprising the steps of providing a muscle relaxant compound having the formula

here R₁ and R₁′ are di- or polysubstituted aralkyl or aralkenyl; provided that at least one substituent on each aralkyl or aralkenyl group is alkoxy or acyloxy; R₂ and R₂′ are alkyl or alkenyl; A is normal or substituted alkanedicarbonyl, alkenedicarbonyl, alkynedicarbonyl, cycloalkanedicarbonyl, cycloalkenedicarbonyl, bicycloalkanedicarbonyl, bicycloalkenedicarbonyl, polycycloalkanedicarbonyl, polycycloalkenedicarbonyl, or aromatic dicarbonyl; n is 0, 1, or 2; m is 0, 1, or 2; p is 0, 1, or 2; R₃ and R₃′ are H, CH₃, or lower alkyl; R₄ and R₄′ are H, CH₃, or lower alkyl; R₃ and R₄ together can also be —(CH₂)_(g)—, —CH═CH—,—(CH₂)_(h)—O—(CH₂)_(k)—,

or —(CH₂)_(h)S—(CH₂)_(k)—, where g is 2, 3, 4, or 5, h is 1 or 2, and k is 1 or 2; and R₃′ and R₄′ can also be —(CH2)_(g)—, —CH═CH—, —(CH₂)_(h)—O—(CH₂)_(k)—,

or —(CH₂)_(h)—S—(CH₂)_(k)—, where g is 2, 3, 4, or 5, h is 1 or 2, and k is 1 or 2; wherein R₁ and R₁′, R₂ and R₂′, R₃ and R₃′, and R₄ and R₄′ can be the same or different; and X is a pharmaceutically acceptable anion; and administering the muscle relaxant compound to a mammal.
 2. The method of claim 1, wherein A is selected from the group consisting of trans-3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl, 1,9-nonanedicarbonyl, cyclobutan-1,2-dicarbonyl, cyclohexane-1,3-dicarbonyl, oxalyl, malonyl, succinyl, glutaryl, adipoyl, pimeloyl, and suberoyl.
 3. The method of claim 1, wherein R₁ is the same as R₁′ and is alkoxy substituted aralkyl, acyloxy substituted aralkyl, or alkoxyacyloxy substituted aralkyl; A is trans-3,6-endomethylene-1,2,3,6-tetrahydrophthaloyl; R₂ is the same as R₂′, and is methyl; n and m=1; R₃ and R₄, are —(CH₂)₂—and R₃′ and R₄′ together are —(CH₂)₂—.
 4. The method of claim 3, which is bis[N-(2,5-dimethyoxybenzyl)tropanium-3α-yl] trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide.
 5. The method of claim 3, which is bis[N-(4-acetoxy-3,5-dimethoxybenzyl)tropanium-3α-yl] trans3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide.
 6. The method of claim 3, which is bis[N-(4-acetoxy-3-methoxybenzyl) tropanium-3α-yl] trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide.
 7. The method of claim 3, which is bis[N-(3,4-diacetoxybenzyl) tropanium-3α-yl] trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide.
 8. The compound of claim 3, which is bis[N-(3,4-diacetoxybenzyl)tropanium-3β-yl] trans-3,6-endomethylene-1,2,3,6-tetrahydrophthalate dibromide.
 9. The compound of claim 2, wherein R₁ is the same as R₁′ and is alkoxy substituted aralkyl, acyloxy substituted aralkyl, or alkoxyacyloxy substituted aralkyl; A is 1,0-nonanedicarbonyl; R₂ is the same as R₂′ and is methyl; n and m=1; R₃ and R₄ together are—(CH₂)₂—; and R₃′ and R₄′ together are —(CH₂)₂—.
 10. The compound of claim 9, which is bis[N-(3,4,5-trimethoxybenzyl)tropanium-3α-yl] 1,9-nonanedicarboxylate dibromide.
 11. The compound of claim 9, which is bis[N-(4-acetoxy-3,5-dimethoxybenzyl) tropanium-3α-yl] 1,9-nonanedicarboxylate dibromide.
 12. The method of claim 2, wherein the R₁ is the same as R₁′ and is alkoxy substituted aralkyl, acyloxy substituted aralkyl, or alkoxyacyloxy substituted aralkyl; A is cyclobutane-1,2-dicarbonyl; R₂ is the same as R₂′, and is methyl; n and m=1; R₃ and R₄ together are —(CH₂)₂—.
 13. The method of claim 1, wherein the mammal is human. 